Updating

**clarion44** · July 1st, 2012, 02:46 AM

I'd like to add 300blk (9") to my form 1 for my SBR.

How do I go about doing that?

Thanks

**Toxicodendron11** · July 1st, 2012, 06:27 AM

Originally Posted by clarion44

I'd like to add 300blk (9") to my form 1 for my SBR.

How do I go about doing that?

Thanks

If you have a lower, on a Forum 1, you can put any caliber upper on it.(that will fit) There is no need to "add" it to the Forum 1. As long as you keep the upper, in the caliber, that is originally listed on the Forum 1. I routinely run a short barrel .22 upper on my 5.56/.223 SBR lower.

**Kramer** · July 1st, 2012, 09:22 AM

Originally Posted by Toxicodendron11

If you have a lower, on a Forum 1, you can put any caliber upper on it.(that will fit) There is no need to "add" it to the Forum 1. As long as you keep the upper, in the caliber, that is originally listed on the Forum 1. I routinely run a short barrel .22 upper on my 5.56/.223 SBR lower.

Good post. Like he said you can put any upper on it, but if another upper becomes a permanent change then you will need to notify the ATF so they can update the registry.